1. EOT - Embedded OpenType fonts

    Type of font that can be derived from a regular font, allowing small files and legal use of high-quality fonts. Usage is restricted by the file being tied to the website

  2. Opus audio format

    Royalty-free open audio codec by IETF, which incorporated SILK from Skype and CELT from Xiph.org, to serve higher sound quality and lower latency at the same bitrate.

  3. rel=noopener

    Ensure new browsing contexts are opened without a useful `window.opener`

  4. TTF/OTF - TrueType and OpenType font support

    Support for the TrueType (.ttf) and OpenType (.otf) outline font formats in @font-face.

  5. WOFF - Web Open Font Format

    Compressed TrueType/OpenType font that contains information about the font's source.

  6. WOFF 2.0 - Web Open Font Format

    TrueType/OpenType font that provides better compression than WOFF 1.0.

  7. cachestorage api: open

  8. clients api: openwindow

  9. document api: open

  10. eventsource api: `open` event

  11. eyedropper api: open

  12. hiddevice api: open

  13. hiddevice api: opened

  14. htmldetailselement api: open

  15. htmldialogelement api: open

  16. idbfactory api: open

  17. idbfactory api: open: `options` parameter for setting temporary/persistent storage.

  18. idbindex api: opencursor

  19. idbindex api: openkeycursor

  20. idbobjectstore api: opencursor

  21. idbobjectstore api: openkeycursor

  22. idbopendbrequest api

  23. idbopendbrequest api: `blocked` event

  24. idbopendbrequest api: available in workers

  25. midiport api: open

  26. paymentrequestevent api: `openwindow()`

  27. rtcdatachannel api: `open` event

  28. serialport api: open

  29. storagebucketmanager api: open

  30. usbdevice api: open

  31. usbdevice api: opened

  32. websocket api: `open` event

  33. window api: open

  34. window api: opener

  35. window api: open: `features` parameter accepts `"attributionsrc"` value

  36. window api: open: `features` parameter accepts `"popup"` value

  37. window api: open: one `window.open()` call per event

  38. window api: open: opened relative to the multi-screen origin

  39. xmlhttprequest api: open

  40. css at-rule: `@font-face`: opentype cbdt and cblc rendering

  41. css at-rule: `@font-face`: opentype colrv0 rendering

  42. css at-rule: `@font-face`: opentype colrv1 rendering

  43. css at-rule: `@font-face`: opentype sbix rendering

  44. css at-rule: `@font-face`: opentype svg rendering

  45. css property: list-style-type: disclosure-open

  46. css selector: open

  47. css selector: `:popover-open`

  48. html element: details: open

  49. html element: dialog: open

  50. headers http header: cross-origin-opener-policy